Typewriting machine



May 6, 1941. B. R. RuMBUTls TYPEWRITING MACHINE 1 '7 Sheets-Sheet 1 Filed Dec. 13, A 19:58

" `1 VE ToR.

ATTORNEY May 6, 1941- B. R. RuMBurls 2,240,578

TYPEWRIIING MACHINE Filed Dec. 13, 1938 7 Sheets-Sheet 3 A T TO R NIE)v B. R. RUMBuTls TYPEWRITING MACHINE Filed Dec.

May 6,'1941.

13, 1958 7 Sheets-Sheet 4 FIGJZ. fm

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IN VEN TOR. @www WW" .ATTORNEY May 6, 1941. B. R. RuMBUTls TYPEWRITING MACHINE 7 Sheets-Sheet 5 Filed Dec. 13, 1938 INVENTOR. Wwe;

A TTORNEY May 6, 1941' B. R. RuMBu-rls 2,240,578

TYPEWRITING MACHINE Filed Dec. 13, 1938 7 She'bs-Sheet 6 103 INVENTOR.

ATToRNEx/- May 6, 1941.

B. R. RuMBuTls TYPEWRITING MACHINE Filed Dec. 13, 1938 vvv sheets-sheet 7 FIGJB.

INVENTOR W ATTORNEY Patented May 6, 1941 TYPEWRITIN G MACHINE Bernard R. Rumbutis, Rochester, N. Y., assignor to International Business Machi nes Corporal tion, New York, N. Y., a corporation of New York Application December 13, 1938, Serial No. 245,365

(ci. iov-' isi) 16 Claims.

This invention relates to typewriting machines.

The broad object of the present invention is to provide an improved ribbon feeding mechanism suitable for the preparation of the master sheets used in duplicating machines and for the'preparation of manifold copies.

An object is to improve the machine disclosedA in application Serial No. 155,363, filed July 2i, 1937, by John L. Petz. This application describes a mechanism wherein the movement of the carriage feeds an auxiliary ribbon which may be utilized for the preparation of master sheets in duplicating machines.

An object of the present invention is to simplify the construction of the machine disclosed in the aforesaid Petz application by reducing the size of the rather large and cumbersome frame mounted at the rear of the carriage which, in that machine had to be at least twice as long as the maximum travel of the carriage.

Another object is to provide means whereby the ribbon may b'e more completely exhausted of transfer material without, however, utilizing any portion of the ribbon more than once.

Another object is to improve the paper bail mechanism to prevent damage tothe auxiliary ribbon in the event that the operator attempts to move the auxiliary ribbon to the typing position while the paper bail is in cooperation with the platen.

Another object is to provide means for preventing wasting of the ribbon for such operations of the machine as are not accompanied by the printing of characters as, for instance. when the carriage is moved by hand or by a tabulating operation.

An object is to improve the ribbon guides to prevent as far as possible the `disagreeable re suits of scraping of the transfer material from the ribbon. i

An object is to provide a ribbon feeding nicchanism which produces an even leed and a more constant feed than the one disclosed in the More said Petz application.

An object is to provide a feed inecm for an auxiliary ribbon which is not `wwdeiut upon the friction of the ribbon in the des. to aintain the ribbon taut at the Writing line.

An object is to provide a ribbon feeding mech anisn in which the feeding of the ribbon is close ly controlled at all timesV and by means oi which a constant tension ismalntained on the ribbon without risk of breakage thereof as a consequence oi the inertia of the supply roll.

An object is to provide a means for preventing 'feeding of the auxiliary ribbon when the machine is not being used for the preparation of master sheets, carbon copies, or other work requiring the use of the auxiliary ribbon.

An object is to provide a movable means for supporting and guiding the auxiliary ribbon at the printing line operable to carry the auxiliary ribbon to 'an inactive position with means re sponsive to the movement of the ribbon to inactive position for preventing feeding of the auxiliary ribbon when it is not in use.

Further objects o the instant invention reside in any novel feature of construction or operation or novel combination of parts present in the ernbodiment of the invention described and shown lin theaccompanying drawings whether within or .without the scope of the appendedl claims and irrespective of other speciilc statements as to the scope of the invention contained herein.

In the drawings:

Fig. -1 is a plan view of the machine.

Fig. 2 is a rear elevation.

Fig. 3 is a right side elevation of the machine and shows the ribbon supporting and guiding frame in elevated position.

Fig. 4 is a right side elevation showing the ribbon supporting and guiding frame in writing position.

Fig. 5' is a large scale view of the ribbon feeding and control mechanism.

F 6 is a vertical section on the line 6-6 in Fig5. 'I is a horizontal section on line 1-1 in Fig. f Figs. 8 is a vertical section on the line 8-8 i Fig. 9 is a vertical section on the line '9-9 in Fis. 5.

Fig. l0 is a vertical section on the line ill-it in Fig. 9.

Fig. il is a large scale oblique view of one of the front ribbon guides as viewed in the direction oi the arrows il-ii in Fig. 3.

Fig. l2 is a large scale oblique view of one of the rear ribbon guides as viewed in the direction oi' the arrows ii--ii in Fie. 3.

Fin. i3 is a large scale vertical section on the line iii-iii in Fig. l.

Fie, la is a large scale plan Viewl of the mechanism shown in section in Fig. 13.

The invention herein described` is shown as applied to the well known International elecarrears such parts of the machine as may be directly involved. l

The ribbon feeding mechanism is mounted upon a long casting 20 which is secured to the base 2i of the typewriting machine. The casting 23 extends to right and left as shown in Fig. 1, beyond the base of the typewriting machine for a purpose which will be apparent hereinafter. 'I'he frame 20 at its right hand end (Fig. 1), or the left hand end as viewed in Fig. 2, rotatably supports a pair of ribbon feeding rollers 22, 23. The roller 22, as best shown in Fig. 8, has a resilient facing of some such material as rubber or cork of high frictional quality and is rotatably mount'- 'ed on a stud 2t carried by a boss in casting 2u scrape some of the material with which the ribbon is coated from the ribbon in the form of dust,

then this dust settles upon the clothing or theoperator, on the machine, and upon the surrounding desks. Since this material spreads when wet,

it is highly desirable to reduce the scraping ef'- fect upon the ribbon to the smallest amount possible. It should also be mentioned that the uncoated side of the ribbon is shown by stippling in the drawings and faces upwardly as it is led from the supply roll 36A whereby the coated side does not rub upon the ribbon guide 39.

The ribbon. is wound upon a storage spool 43 which is pivotally mounted at 4l (Fig. 2) in the casting 20. From the storage spool .Ill the ribbon 'extends diagonally upwardly and to the right in Fig.' 2 and around a roller 42 rotatably mounted on a stud 23 in the same general fashion as the roller 22. From the roller 42, the ribbon extends horizontally to the left and around roller carried by the carriage hereafter to be described. The

by means of anti-friction bearings comprising y I two rows of balls 25. The roller 22 isin the form of a hollow shell which is somewhat longer than its diameter and is 'turned to form a pulley 23.

. The rows of balls roll on the shank of the stud 24 and are kept in spaced relation by a ball race 21 pressed into roller 22. The right hand row of balls 25 bears against a collarY 28 on the stud 23 while the left hand rowof balls-bears against the inside of the slotted head of stud 2t. Also se' cured to the roller 22 is a ratchet wheel 29 for a purpose which willbe made clear hereinafter.

The roller 23 similarly has a resilient facing in contact with the facing on roller 22 and is rotatably mounted on a stud (Figs. 2 and 5) which is carried by the end of a rock arm 3 i This rock arm 3i, as best shown in Figs. 3, 5, and 8, is

secured to a stud 32 which is rotatable in a hole.

bored in a boss formed in the casting 2U. and retained in the hole by means of a nut and washer generally designated 33. The stud 33 as shown' roller 42 like the roller 22 has a ratchet wheel M, the purpose of which will be made clear hereinafter.

The main framework of the carriage, as shown in Figs. 1 and 2 comprises'sideplates45 rigidly l joined in the usual way byA a channel-shaped member 43 (Fig. 3) which acts as a track for by-step during the writing of lines by escapement in Figs. 1, 3, and 8 is secured on the arm 3i by a relatively long nut 34 which is turned down so as to be rounded at its ends-to serve as a linger piece for the purpose of disengaging the roller 23 from the roller 22. Coiled around the boss in which the stud 32 is pivoted, is a torsion spring 33 which is hooked around one arm of the lever 3i and around a stud carried by the frame 20 so as to tend to rock the arm 3i clockwise in Fig. 5 to hold the roller 23 in contact with the roller 22.

The rollers 22, 23 are operative to withdraw the ribbon V36 from a ribbon supply spool 31. The spool 31 is removably rotatably mounted in a well known way at 38 on a boss formed in the casting 20. The ribbon 36 extends diagonally upward and to the left (Fig. 2) between the rollers 22 and 23, over-the top of the roller 22 and thence horizontally to the right to one of a pair of rollers hereafter to be described which are mounted upon the carriage of the typewriter for the purpose of guiding the ribbon 33 to and from the rear ribbon guides on the carriage.

'There is attached to one arm of the rock lever 3i' a ribbon guide 39 which is U-shaped to pro- 'o vide two arms between which the ribbon 38 passes. In order to avoid the ribbon guide 39 scraping the ribbon 36, all the edges of thel ribbon guide are lared as`clearly shown in Figs. 2 and 3 whereby only round surfaces engage the edges and the uncoated side of the ribbon 36. It has been found from experience that in machines utilizing hectograph ribbons, the ribbon guides tend to mechanism mounted on the rear rail 48. This escapement mechanism includes a pair of pawls 52 (Figs. 3, 6, and 7) vwhich are shown in section in Fig. 6 and in dotted lines in Fig. '1. These pawls cooperate with the usual .escapement rack 53 (Fig. 3) secured to the bottom ofthe channelshaped member d6.

APivotally mounted in the carriage adjacent vside plates 45 at 5t are the usual carriage release levers 55, -one of which is best shownin Fig. 3. The carriage release levers cooperate with a bail S6 which is pivotally mounted between the side plates d5. This bail engages the usual escapement release arm 51 which, as shown in Figs. 6 and 7, is provided with a lug 51am a position to be engaged by the bail 56. The escapement release lever 31 also has a lug or arm E112 which is bent downwardly behind the rear rail 48 and underneath the rail as'shown in Fig. 6 and then upwardly between the escapement pawls 52 and the rack 53. When the carriage release lever 55 is rocked in a counterclockwise direction (Fig. 3) the bail 56 is similarly rocked and, by engagement with the lug 51a, causes the arm 51 to rock about a vertical axis consisting of a stud 58 on the rear rail 8. This movement oi the arm 51, through the cooperation of the lug i117 with the pawls 52, disengages thelatter from the escapewhich includes two arms69 (Figs. 1 to 5) which are pivotally mounteg at 60 in the extension plates U. The arms 9 are integrally joined together near their pivots 60 by a tube 6I which is weldedor brazed to said arms. The right hand arm 59 (Fig. 1) is provided with a hand lever 62 (see Figs. 2 to4) which is riveted or otherwise fastened toarm 59 for the purpose of raising the ribbon guiding frame when the ribbon 36 is to be shifted from a typing to a nontyping position. In order to limit the upward movements of the frame comprising the arms 59 and the tube 6|, the plates 59 are provided with extensions having bent-over lugs 59a in the plane ofthe arms 59 so as to restrict their upward movements. For the purpose of yieldingly holding the frame 59 with the ribbon 36 in operative and inoperative positions, there is provided a pair of toggle springs 63 each associated with one of` the arms 59.- These toggle springs, as best shown in Figs. 3 and 4, are hooked around pins 64 carried by the arms 59 and pins 65 carried by the extension plates 50.

Provision is made for supporting the frame including the arms 59 in either of two typing positions for the purpose of completely utilizing the charged side of the ribbon 35. For this purpose a shaft 65 is rotatably mounted in the extension plates 5!) (Figs. 1, 3 and 4) and secured to the ends of this shaft 66 are finger levers 61 by means of which the shaft may be rotated by hand. The finger levers 61 are formed with abutments 61a (Figs. 3 and 4) which coact with the studs 65 to limit rotation of the finger levers 61 and shaft 66. The finger levers 61 are held in the positions shown in Figs. 3 and 4 by means of a toggle spring 68 which is connected to a stud carried by one of the finger levers 61 to a cross rod 69 (see Figs. l and 2 also) which'rigidly joins the carriage side plate 45 and also acts as a means of securing the extension plates 50 to the side plates 45.

Eccentric studs 10 (Figs. 3 and 4) are carried by the arms 59 and are so located on the arms as to cooperate with projecting portions 6117 and notches 61e formed in the nger levers 61. When thenger levers are in the position shown in Fig. 3, the projecting portions 6Ib of guiding the ribbon to the carriage from the roller 22 and fromthe carriage to the roller 42 there is provided a pairof guide rollers or pulleys 11a, 1lb (Figs. 1 and 5) which are rotatably mounted on studs 12 carried by a bracket 13 which is secured to the tube 6i joining the arms 59. The bracket 13 is located at the middle of the tube 6I and the feed rollers 22, 42 are located far enough apart so that both the Ipulleys 1Ia, 1lb always are between the feed rollers 22, 42 regardless of the position of the carriage. The ribbon 36 is guided to rollers lla, 1lb by means of guides 13a secured to bent-over lugs formed in bracket 13. The ribbon guides 13a are flared like the guide 39 and are C-.shaped in section transversal of ribbon 36 so as to extend around the edges of the ribbon as shown in Fig. 1.

As best shown in Figs. 1 and 5, the two stretches of ribbon 39 from the rollers ia and the roller]A lib, respectively, extend to right and left (Fig. l) towards the rear ends of the extension plates 56. At these 'points the carriage is .provided with rear ribbon guides one of which is shown on a large scale in Fig. v12. The ribbon guide includes a bracket it which is secured to the right hand on the nger levers are in the arcuate paths of movement of the stud 1I whereby, when the `frame including the arms 69 is lowered Yto typing arm 59 and is bent upwardly, outwardly, and downwardly like an inverted U. A cylindrical ribbon turning member 15 is secured to the outer downwardly extending arm 'lila of the bracket and extends diagonally rearwardly towards the center line ofthe carriageat an angle of 45 to the right hand arm 59. Secured to the outer or free end of the turning member 15 is a flat oval guide plate 16. Rotatably mounted on a stud 1l carried by the bracket 14 is a guide roller 18.

The ribbon 36 extends from the roller 1 la substantially horizontally to the right in Fig. 1 or to the left in Figs. 2 and 5 over the free end of 'the member 15, thence downwardly and forwardly under the forward end of the member 15, and then passes under the roller 18 as shown in Fig. 4. 'I'he plate 16 cooperates with the edge of the ribbon 36 to prevent it vfrom slipping off the rear end of the turning member 15 and in a similar way the downwardly projecting portion 14a. of the bracket 14 prevents the ribbon from slipping oil. the forward end of the ribbon guide 15 and from the roller 1 8. The bracket 14 is formed with an ear 14h which cooperates with the edge of the ribbon adjacent the inner end of roller 18. The ribbon guide at the rear left hand corner of the machine (Fig. 1) which guides the ribbon the studs 10 will'enter the notches 61o anda used with the frame 59 in the position of Fig. 4

whereby the nal third of the ribbon will be utilized. By this procedure the ribbon is exhausted of transfer material.

-The frame including the arms 59 is provided withribbon guides. and guide rollers by means of which the ribbon is delivered to the carriage and along the writing line behind a work sheet to the lefthand roller 1lb is similarly constructed but the positions of the parts are reversed in relation to the righthand ribbon guide.

The forward ends of the arms 59 are provided with rollers 19 mounted on studs 80 which rollers guide the ribbon 36 to and from the front ribbon guides. The right hand front ribbon guide is best illustrated in Figs. 3, 4, and 11. The front ribbon guide comprises a bracket 6| which is secured to the side ofthe arm 59 and is formed with an arm Bla bent to the left (Figs. 1 and 11) toward the middle Vof the carriage at an angle of 45 to the plane of arm' 59. Secured to the bent portion of the bracket bi is a cylindrical turning member 82 similar to the members 15 and having a guide plate til secured to the right hand end of the member t2.

Secured to the member t adjacent to bracket ti is a. marginal guide element Vdil (Figsr3, 4 and ll) of which the lower portion is bent U-shaped so as to project partly around the lower edge of the ribbon 3d and upwardly approximately a third wrapped around the platen 5|. For the purpose ofthe width of the ribbon. The upper portion of the marginal guide 86 is merely bent'at right angles to the planel of the ribbon as best shown in Figs. 3 and 4. In order to prevent the edges of the marginal guide element 84 from stripping the transfer material from the ribbon 3 the edges versed in relation to the right hand front ribbon guide. A guide 39a, similar to the guides 13a, 'lab f 'and mounted on a bracket 38h xed to casting 2t,

guides the ribbon 36 to roller 42. t t

, The members 82 and the marginal guide elements 84 of the front ribbon guides direct the ribbon 36 in a horizontal straight stretch along andere tionedjbehind the work sheet so that the hectogr'aph material is deposited on the back'of the sheet. Master sheets for 'machines fusing gelatineblankets or gelatine transfer rollers, such as the Ditto duplicator, are prepared by placing the ribbon in front of the work Vsheet with/the coated side of the ribbon facing the work sheet. in preparing photo-litholnaster sheets, a special carbon ribbon is used and placed in front of the master sheet with the coated` side facing the work sheet. Carbon copies may also be prepared by usingan ordinary carbon ribbon between two sheets with the coated side facing the sheetnext to the platen. f l5 `rihe movement of the carriage is utilized to ro- 'tate the feed rollers 22, 28, by means shown in the writing line in front of the platen v5i as in f Fig. l. When the ribbon supporting frame in cluding the arms 58 is in the lower of the two typing positions the portion of the ribbon along the,

center thereof is at the typing line and the width of the ribbon is such that a strip comprising approximately a third of the width of the ribbon is 425 utilized. When the ribbon is rethreaded and the frame including 'member 58 is positioned in its upper typing position, the lower third of the ribbon is utilized. It is obvious that if .the ribbon is again rethreaded so that the exhausted edge portion is located above .its original position, the third portion of the ribbon may be utilized by maintaining the frame including arms B9 in the uppermost typing '.position. Thus, by passing the ribbon through the machine three times, it is possible to utilize vthe entire width of the ribbon and thereby exhaust the ribbon completely without using any portion twice. v

'I'his is an important feature of applicants in.-

vention because hectograph ribbons in particular are quite expensive. and it is highly desirable' to utilize every portion of the ribbon in the interests of economy. It is not practical to use .any portion of a hectograph ribbon twice because, when the type strikes through a portion of the ribbon which has beenprevio'uslyutilized, certain por tions of the letters on the master sheet 'willgreceive insufficient amounts of hectograph material or none at all. As a result, when the master so sheets are utilized in the duplicating machine, certain letters will appear more faintly than others or fail to print entirely making the duplicate copies wholly or partly unintelligible.

Figs. 1, 2, 8, 5, and 8' to 1'0. The bracket 'I8 is provided .with a bentover lug 13b to which is anchoredboth ends of a feed belt 85 in the form of a fabric tape. This feed belt 85 passes over the pulley 28 and around an idler pulley 86 rotatably mounted on a stud'81 located adjacent the feed roller 82. In order to maintain tension in the feed ben ed there is provided a spring asa (Figs. 2 and 5) of which one end isl anchored to a clip 85h attached to the bent-over lug 13b. The

other end of the spring 85a. isanchored to the belt 85 in such a fashion as to maintain a slack loop in the belt. As the carriage movesto the left (Fig. l) or to the right (Fig. 5) during'the typing of a line, the feed belti causes the feed rollers 22 and 28 to rotate in a direction to payout the ribbon from the supply roll 31 to the-lefthand roller ila in Fig. 5, the-feed rollers 22 and 23. pulling the ribbon from the storage spool 31.

In order to maintain a tension on the ribbon 36 while the carriage moves in writing a line, there ,is provided a take-up device for rotating storage spool 40. This device includes a pulley 88 (Fig. 2) which is secured to a rotatable stud on which the storage spool 40 is mounted. A feed belt 89, which7 may be in the#form of a coil spring, passes around the pulley 88 and vunder idler pulleys 80 carriedby a bracket 9| secured to a ange on casting 2D and then around'a pulley Sia (Fig. l) mounted on or-forming a part of the power roller Sib of the machine. The

power roller thus always tends to rotate the take- After the ribbon has been exhausted of transfer l material along one edge, it is nmerely necessary to interchange the spools 31 and 40 and turn over spool 40 in order to utilize the edge portion of the ribbon opposite the exhausted edge. Conven- ,iently the machine may be initially operated with finger levers 61 positioned as in Figs. 3 and '4 so other edge. Then the finger levers 61 may be set to utilize the central portion of the ribbon. l How '35 ever, this order is not absolutely vital vto complete exhaustion of the ribbon as the operatorcan easily up spool Ml in a clockwise-direction (Fig. 2) but the tension of the belt 88 is such that the belt will slip when the ,ribbon is under tension.I By this means the ribbon. is maintained under proper tension in the ribbon guides when the car- In order to prevent reverse rotation of the i'eed- @rollers 22, 23 and pulley there is provided va pawl 82 (Figs. 5, 9, and l0) cooperating with the ratchet 2,8.and a pawl`83 cooperating with the ratchet M. These pawls are rotatably mounted on studs 84, 85 respectively, carried by casting 20. The pawls 82, 8l are actuated by 'torsion springs like 82a in Figs. 9 and 10 which illustrate the mounting of the pawl '82 associated with the L 'ratchet 29.

determine by inspection of the portion of the rib- -bon at the writing line how to set levers 81.

in preparing master sheets for duplicating machines which use the master sheet as the-'printing member, such as the "New Process duplicator, a

hectograph ribbon is used and is threaded through the znachine so that the vcoated side facesaway Owing to the high cost of hectograph ribbon it is desirable that the feeding of the ribbon be prevented during operations of the '/machine which do not include typing, as during tabulating peratlons'or when the carriage is moved by hand. Obviously, if no means were provided(to prevent such ,Lactionvthemoving of the carriage to the left (Fig. 1) by hand or in tabulating would trom the platen. this case the ribbon is t 75 cause the ribbon to feed an extent corresponding 2,240,578 to the amount ofmovement of the carriage since I the ribbon travels with the carriage and the rollers 22, 23 are actuated by the carriage movement. The means for preventing the feeding of the ribbon is controlled by the lever 51 (Fig. 7) which is operated to disengage the feed pawls 52 each time the carriage is tabulated or moved by hand. Pivotaily mounted on the studs 94 and 95 (Figs. 5, 9, and are detent pawls 98 whichv are designed to engage the teeth in the ratchets 29, 4l so as to prevent rotation of the feed rollers 22, 29 and pulley 42. The pawls are operated by a system of links and arms which includes links 91 connected to arms formed in the pawls 95 and to arms 98 (Figs. 1, 2, 5, 6, and '7) loosely mounted on a vertical shaft 99 located near` the center line of the machine and journaled in vertically aligned bearings comprising holes formed in the casting as best shown in Fig. 5. 'I'he shaft 99 is rotatably supported on a thrust bearing consisting of a ball i (It. Secured to shaft 99 below the arms 9i) is an arm i9! on which is mounted a long pin ist which extends upwardly through the planes of both arms'y Qt. Springs ID3, anchored to studs carried by the arms 98 and to the pin ilii, pull the arms at into engagement with the pin i532. shaft 99 is a lever itt to which is connected a link M5. This link extends toward the front of the machine and into engagement with the downward projecting portion of arm El behind the rear raill. The free end of the link ldd, passes through a hole in 4the cover plate it@ (Fig. 3) at the rear of the machine. This cover plate is L- shaped in vertical section so as to have a vertical Secured to the upper end of the' |09a on the arms |09 are operative inv a well known wy to hold the paper ban 11i-either its the studs |99a are collars H4 of resilient material such as rubber in the plane of the extension plates lll. 'I'hese plates cooperate with the rubber collars toA limit clockwise movement of the arms |99 in Figs. 3 and 4. The collars i It a'ct as cushions to prevent damage to the paper bail in the event that it is snapped back rapidly by operator oi the machine.

It is desirable that the machine be capable oi use as a correspondence machine and for general oiiice work. It is desirable, therefore, that means be provided to prevent the lowering of the ribbon guiding frame including the arms 5S to either of the typing positions when the paper bail yis in cooperation with the platen in order to prevent tearing of the hectograph ribbon. 1It is also desirable that when the machine is used in preparing a hectographmaster sheet that the paper .bail be raised automatically whenever the ribbon guiding frame is raised to non-typing poilangeV extending parallel with the carriage in" which vertical flange is located the hole-which guides the link |05 as shown in Figs. 2 and 3. A spring |91 (Figs. 2 and 5), anchored to a stud carried by the casting 20 and to the right hand.

detent 96 with reference to Fig. 5, serves to maintain `the mechanism including the links 91 in a position with thel detents 96 disengaged from' the ratchets 29 and M and with the free end of link lill abutting the arm 51 as in Figs. 6 and 7.

The tabulator lever |99 which cooperates with lug 51e formed in arm 91 is actuated duringeach tabulating operation in a direction to move the left hand end of the arm 91 (Fig. 7)- counterclockwise in this figure thereby pushing the link` |09 rearwardly of the machine with reference to Fig. l. This causes the shaft 99 to rock in a counterclockwise direction (Figs. 1 and "l) thereby causing the links 91 tomove to the right in Figs. 5 and 'l or to the left in Fig. l. As a result, the detents 96 are also rocked in a counterclockwise direction (Fig. 5) to bring the noses of the detents into engagement with the ratchets 29 and M thereby locking said ratchets and the rollers 22. 29. 42 against rotation and preventing feeding oi' the ribbon. The same action takes place whenever one of the carriage release levers t is operated to permit moving the carriage by nd. The spring dta stretchesV slightly when the carriage is moved in a letter writing direction, and permits the feed belt ii@ to slip on the pulley tti.

The carriage is provided with a paper bail ier the purpose of holding wort; sheets against the platen. This paper bail is shown in Figs. i, Zi, and 'i and includes a pair of arms its joined by a rod iid: The arms iii@ are pivoted upon studs i ii 'on the carriage side plates lti. The arms it@ are rigidly joinedvtogether adjacent the studs ii i by a tie rod iii. Springs iii) anchored to pins carried by the extension plates 5t and to sts sition as otherwiseithe paper bail will obstruct the free movement of the ribbon and result in tearing the ribbon since it is only thin coated paper. Accordingly, means is provided which has the dual purpose of causing the paper bail to be raised automatically when the ribbon` supporting frame is raised to non-typing position and oipreventing the lowering oi. the ribbon frame when the paper bail is in cooperation with the platen. v .y

This means comprises a bracket H5 secured to the side of right arm |09 of the paper bail as shown in Figs. 1, 3, and 4. The hand lever 62 is formed with a bent-over lug 62a designed to cooperate in two dierent ways with bracket H5. When the paper bail is in cooperation with the platen and the frame comprising arms 59 is in the non-typing position as in Fig. 3, the bracket Ill is in the arcuatepath of movement of the lug 92a whereby, if itis attempted to lower the frame including members 99, the bracket lll will prevent the frame from being lowered more than 4) whereby, as the frame is raised, the paperbail will likewise be raised.

The paper bail swings on a considerably shorter radius than the ribbon supporting frame whereby it is possible for the lug 62a to pass the lug H5 when the paper bail is in such position that the spring l I9 can draw the paper bail to the raised position shown in Fig. 4. In this iig-A ure, the broken lines indicate the position of the lug H5 in relation to the lug 82a when both the paper bail and the ribbon guiding frame are in position to cooperate with the platen. in Fig. Ii

the dot and dash line indicates the position of the lug 62a. when by cooperation thereof with bracket HES, movement ot the ribbon guiding frame is limited an extent sumcient to prevent the ribbon tt from' engaging the paper bail.

Onel advantage of the ribbon'feedlng mechanism disclosed herein over thevmechanism disclosed in the Petz application is that the feeding oi' the ribbon is more closely controlled and consequently is more accurate. In the Petz application the rollers which positively iced the tapa side of the carriage at' which the ribbon is discharged and the rollers merelyv act to take up the slack resulting from the movement of the .car-

riage in letter spacing direction. The'v unwinding of the ribbon from the supply roll is to some extent dependent upon the, pull exerted by the carriage upon the tape at the delivery side of the carriage in consequence of the friction exerted by the ribbon guides upon the tape. The movement 'of the lcarriage is very rapid and that the ribbon supply spool has a relatively large inertia eiect, particularly when full, which tends to cause the supply spool to rotate more than necessary whereby to produce a slack in the rib-` bon tending to make it sag at the writing line or even tending to cause the ribbon to be broken when a twisting force is exerted thereon during the line spacing movement of the platen. `The tendency of the supply spool to over-rotate isuto some extent prevented in the Petz application by a spring which frictionally cooperates with the roll of ribbon on the spool to retard rotation of the'ribbon spool. This, however, tends to aggravate the tendency to break the ribbon due to the inertia of the supply spool. A l

In the machine described herein the supply spool is free to rotate and the ribbon is paid out to the carriage exactly the same amount as the carriage moves and at the-same time the automatic rewind drive for storage spool keeps the ribbon under tension so as to maintain it ,taut in a straight line at the writing -line thereby eliminating any tendency for the ribbon to sag --or move with 4the master sheet in line spacing operations. No dependency in the present case.

is placed upon the friction of the ribbon guides to unwind the ribbon from the spool but the carriage,through the driving belt, effects this function directly and by a uniform amount for each letter spacing operation. In the Petz application the ribbon remains practically slack at the writing line since the only factor tending to keep it, taut is the friction of the guides.

Another advantage vis that the supporting frame for the ribbon feeding mechanism need be only approximately half the length ofthe corresponding frame in the Petz application by virtue of the fact that the ribbon is delivered to the carriage and is discharged from the carriage at a point near the center of the machine instead of at points near the limits of the carriage v travel in each direction. Thus, the machine 'maybe made considerably lighter and more cheaply. The real advantage of this construction, however, is that the machine takes up considerably less space and is^therefore much easier to ship and provides more space on the operators desk for otherthings. Due to the improved construction 'yof the ribbon guides and ribbon turning members, the scraping of the transfer material of the ribbon is reduced to a negligible amount. Actual experience with the machine disclosed in the Petz application showed that the scraping of a. transfer4 material in the fonn of fine dust which vfloated around in the air and settled upon 'adjacent desks and upon the operator proved a very serious objection to the use of these machines because the'hectograph transfer material spreads when moistened and it was found that it caused damage to the operators clothing and to persons working adjacent themachine besides soiling documents and records.

' The'means for preventing the feeding of the si asso-,srs

are located between the storage' spool and the the preparation of master sheets and for other work requiring the use of the auxiliary ribbon 35 is most clearly shown in Figs'. 1, 13 and 14.

, This 'means is rendered eiiective automatically on the shaft I2@ is a block E24 to which is se cured a bracket H25 having an arm l25a. which engages the end of one arm of lever |04. 'Ihis lever, it will be remembered, when rocked in a counterclockwise direction (Fig. 7) causes the links 9i (Fig. 5) to` be moved to the right, thereby through the dogs 96, locking the ratchet wheels las i9 and (is against rotatioirto prevent feeding of the ribbon. y

'-When the auxiliary ribbon 36 is in usea the arms 5a will occupy the position shown in Fig. 4,

thereby holding theA arm E25 in the position shown by solid lines in`that ligure and by broken lines in Fig. 13. This allows ther lever |04 to assume the position shown by solid lines (Fig. 7) and by broken lines (Fig. 14) permitting the ribbon feeding mechanism to operate when the carriage moves. When the arms 59 are moved to the position v shown by solid lines in Figs. 3 and 13, the arm i25a is rocked in a counterclockwise direction (Fig. 13) and thereby rocks the lever ldd in a. counterclockvvise direction (Fig. 14).

This causes thelinks di to be moved to the left (Fig. i4) or to the right (Fig. 5') zo 10er the ratchet wheels 29 and 44 against rotation.

' allowed to spin under the driving force of belt 89.

Itis also desirable to prevent the storage spool dd from rotating when the ribbon feeding mechanism is locked against operation. For this purpose,` one arm of lever' it is provided with a block t28 formed of rilient material like sponge rubber whereby, when the lever 9.04 is rocked to the'position shown by solid lines in Fig. 14, the block 826 will contact the edge of one ofthe sidesof the storage spool 40 and thereby prevent the storage spool'for tendingv to rotate under the linfluence ofthe driving force exerted by the spring belt B9. Thus, the portions of the ribbon between the. storage spool t0 andthe feed rollers 22, 23 is relieved of tension produced by the take-up mechanism. This also has the advantage that,A in the event of the operators removal ofthe ribbon 3B from the ribbon guides oh the carriage, for his or her complete freedom ",The block lzjandthe bracket l25 are held in the position of Fig. 4- in the proper relation-A ship to leverv I 04 by means of a guide block |21' secured to bracket i728 which is fixed to the cover plate |06. which the arm. |25'a passes whereby said arm and the block |24 to which it is fastened may rotate with reference to the longitudinal a'xs of shaft l20 but are prevented from moving with the carriage. Thus, regardless of the position ribbon when the machine is not being used for The block i21 has a slot through it will be understood that various omissions and substitutions and changes in the vform and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention. It is the intention, therefore, to be limited only as indicated by the scope of the following claims.

What is claimed is:

1. In a machine of the class described, in combination with the carriage, ribbon storage and supply rolls mounted at the rear of the carriage and independently thereof, a pair of feed rollers mounted independently of the carriage and oper-I ative to pay out the ribbon from the supply roll, a guide roller for receiving the ribbon and guiding it to the storage roller, means whereby the carriage in its letter spacing movement operates the feed rollers to pay out the ribbon in step with the carriage, ribbon guiding means located at the ends of the carriage, ribbon guides mounted on the carriage and located substantially mid-V way between the ends of the carriage for guiding the ribbon from the feed rollers to the guiding means at one end of the carriage and from the guiding means at the other end of the carriage to the guide roller, means on the carriage for guiding the ribbon along the writing line, and means for rotating the` storage roll to'take up the slack produced in the ribbon in its movement in letter spacing direction, said means being operative to maintain the ribbon under tension along the writing line.

2. In a machine of the class described, in combination with the frame of a typewriting machine a carriage mounted on the frame, ribbon storage and supply rolls mounted on said iframe at the rear ofthe carriage, means mounted on said frame for unwinding the ribbon from the supply roll, a guide roller for receiving the ribbon from the carriage and guiding the ribbon to the storage roll, ribbon guides located at substantially the mid-point of the carriage for receiving the ribbon fed by the feeding means and for guiding the ribbon from the carriage to the guide roller, ribbon guiding means located at the ends of the carriage for receiving the ribbon from the iirst-named guides and guiding the ribbon to the writing line and for guiding the ribbon from the writing line to the rstnamed guiding means, means for guiding the ribbon along the writing line in a straight stretch from one end of the carriage to the other, means actuated by the carriage in its letter spacing movement for operating lthe feeding means to pay the ribbon out to the carriage, and means to rotate the storage roll to take up the slack in the ribbon produced by the spacing movement of the carriage and operative to maintain tension on the ribbon at the Ywriting line.`

3. In combination with Athe carriage for typewriting machines, a platen mounted on' the car- `riage, ribbon supporting and guiding means on inactive position remote from the writing line, a paper holding bail mounted in the carriage and movable from a position in cooperation with the platen to an inactive position, and means operative to prevent movement of the ribbon guiding means to bring the ribbon into its active position when the paper holding bail is in cooperation with the platen.

4. In combination with the carriage for typewriting machines, a platen mounted on the carriage, a ribbon supporting and guiding frame movably mounted in the carriage, ribbon guiding means on said frame for guiding a ribbon in a straight stretch along the writing line, means to move the ribbon guiding frame to an inactive position, a paper holding bail movable into and out of cooperation with the platen, and means to cause the paper holding bail to be moved out of cooperation with the platen when the ribbon guiding frame is raised to its inactive position, said means being also `operative to prevent moving the ribbon guiding frame into its active position when4 the paper holding bail is in cooperation with the platen.

5.- In combination with the frame of a typewriting machine, a carriage mounted on the frame, a supplemental frame mounted on the main frame, ribbon storage and supply .spools `mounted on the supplemental frame, feed rollers mounted at one end of said supplemental frame, a guide roller mounted at the other end of said supplemental frame and operative to guide the ribbon to the storage spool, ribbon guiding means located substantially midway between the ends of the carriage for guiding the ribbon from the feed rollers to the carriage and from thecarriage to the second-named roller, means on the carriage for receiving the ribbon from the lastnamed guiding means and guiding the ribbon thereto and` for guiding the ribbon along the writing line, means to operate said feed rollers in step with the letter spacing movement of the carriage whereby said ribbon is paid out to the carriage from the supply spool as the carriage moves in letter spacing direction, means to take up the slack in the ribbon between the secondnamed roller and the carriage produced by the movement of the carriage in letter spacing direction.

6. In combination with the frame of a typewriting machine, a carriage mounted on the frame, a supplemental frame mounted on the main frame, ribbon storage and Supply spools mounted on the supplemental frame, feed rollers mounted at one end of said frame, a guide roller mounted at the other end of said frame andv operative to guide the ribbon to the storage spool, ribbon guiding means on the carriage and located substantially midway between the ends of the carriage for-guiding the ribbon from the feed rollers to Ithe carriage and from .the carriage to the second-named roller, means on the carriage for receiving the ribbon from the lastnamed guiding means and guiding the ribbon thereto and for guiding the ribbon along the writing line, means to operate said -feed rollers in step with the letter spacing movement of the carriage whereby said ribbon is paid out to the carriage from the supply spool as the carriage moves in letter spacing direction, meaus-V to take up the slack in the ribbon between the secondnamed roller and the carriage produced lby the movement of the` carriage in letter spacing direction, carriage release levers and means controlled by the carriage release levers for locking said rollers against rotation whereby to prevent' feeding of the ribbon when the carriage is moved by hand.

7, In combination with the frame of a typewriting machine, a carriage mounted on the frame, a supplemental frame mounted on the main frame, ribbon storage and supply spools mounted on the supplemental frame, feed rollers mounted at one end of said supplemental frame, a guide roller mounted at the other end of said supplemental frame and operative to guide the ribbon to the storage spool, ribbon guiding means located substantially midway between the ends of the carriage for guiding the ribbon from the feed rollers to the carriage and from the carriage 'to the second-named roller, means on the vcarriage for receiving the ribbon from the lastnamed guiding means and guiding the ribbon thereto and for guiding the ribbon along .fthe Writing line, means to operate said feed rollers in step with the letter spacing movement of the carriage whereby said ribbon is paid out to the carriage from the supply spoolas the carriage moves in letter spacing direction, means to take up the slack in the ribbon between the second-named roller and the carriage produced by the movement of the carriage in letter spacing direction, escapement mechanism for the carriage, means to release the escapement mechanism to permit the carriage to run free and means automatically effective' concurrently. with the release of the escapement mechanism for locking the feed rollers against operation when 9. In combination With the carriage of a type- A writing machine, means to support an auxiliary ribbon on the carriage for movement to andfrom an operative position in winch the ribbon extends along the writing line, a ribbon feeding mechanism, and locking means controlled by movement of .the ribbon to an inactive position to disablev the feeding mechanism.

10. In combination with the main frame and the carriage of a typewriting machine, a ribbon supporting frame movably mounted on the carthe carriage for movement from an active position in which a stretch of theribbon lies along the writing line to an inactive position in which the ribbon is remote from the writing line, means on the carriage to guide the ribbon from the feeding means to the carriage to permit movement of the carriage without disarranging the ribbon, means associated with the ribbon feeding mechanism for rendering it inoperative inriage so as to enable the displacement of a ribbon supported by the ribbon frame from an active position along the writing line to an inactive position remote from the writing line, means on said frame for supporting and guiding the ribbon, ribbon feeding mechanism mounted on the main frame and including a pair of feed rollers for paying out the ribbon to the carriage, means connected to the carriage for actuating the feed rollers whereby to pay the `ribbon out to the carriage in step with its letter spacing movement, locking meansI operable to prevent actuation of the feed rollers by said carriage. and con-` nections between said frame and the locking means for rendering the latter effective when the ribbon supporting frame is moved to the inactive cluding an element having a sliding connection with the carriage, and means on .the carriage connected to the ribbon supporting means for actuating said element.

l12. In combination with the carriage of a typewriting machine, ribbon supporting and guiding means mounted in the carriage for supporting an auxiliary ribbon along the writing line, said guiding` means being movable to permit shifting of the ribbon to an inactive position; ribbon feeding means mounted independently of the carriage and including a pair of feed rollers operable to pay out the ribbon to the carriage as the carriage moves in a letter-spacing direction, means to guide the ribbon from the feeding means to the carriage adapted to permit the carriage to move without disarranging the ribbon, means connecting the feed rollers to the carriage for operating the feeding means when the carriage moves in a letter-spacing direction whereby to prevent relative movement between the ribbon and the carriage to maintain a stretch of said ribbon iml movable along the writing line, and means mounted independently of the carriage for maintaining'the ribbon `under tension along the writing 1ine.-

i3. In combination with the carriage of a typewriting machine, a. platen rotatably mounted in the carriage; ribbon supporting and guiding means movably mounted in the carriage and adapted to support a stretch of ribbon along the writing line on the platen, said ribbon supporting means being movable from an active position, in winch the ribbon lies in front oi' the platen and which the ribbon is clear of the platen; pressure rollers movably mounted on` thecarriage and'v adapted to be brought into an operative relation with the platen lto feed a work sheet, and interlocking means between said pressure rollers and the ribbon supporting-and guiding means to prevent movement of the ribbon supporting means to the active position when the pressure rollers are in operative relation with the platen.

l4.-In'comblnation with the main frame arid carriage of a typewriting machine, ribbon supporting and guiding means mounted in the carriage for movement to carry the ribbon from an active position to an inactive position, ribbon feeding means mounted onthe main frame and including a pair of ribbonfeed rollers, means including a exible band connecting the feed rollers to the carriage for actuating said rollers when the carriage moves in a letter spacing direction, and

means rendered operative by movement of the,

ribbon supporting and guiding means to the inactive position for locking the feed rollers against operation."

l5. In combination with the carriage of a typel writing machine, means to support and guide a ribbon along the writing line; a frame for supporting the guiding meanasaid frame beingmovn l ,a4o,s7 able to carry the ribbon from an active position along the writing line to an inactive position; ribbon storage and supply spools mounted independently of the carriage, ribbon feeding mechanism including a pair of feed rollers for withdrawing the ribbon from the supply spool and paying out said ribbon to the guiding means on the carriage, means to guide the ribbon from the guiding means on the carriage to the storage spool, power operated means for actuating the vstorage spool to take up slack produced in the ribbon by letter spacing movement of the carriage and to maintain the ribbon under tensionand means controlled by 4movement of the frame for rendering the ribbon feeding mechanism inoperative when said frame is moved to carry the ribbon to the inactive position.

16. In combination with the main frame and carriage of a typewriting machine; means to support and guide a ribbon in a straight stretch along the writing line, said means being movable to carry the ribbon from an active position along the writing line to an inactive position remote from the writing lineiqibbon feeding mechanism mounted on the mai frame and operative to pay out the ribbon to the carriage as the carriage moves in a letter spacing direction, and means including an articulated connection between the ribbon supporting means and the feeding mechanism for rendering the ribbon feeding means inoperative when the supporting means is moved to 'the inactive position.

BERNARD R. RUMBU'rIs. 

